/* Name: usbdrv.c * Project: AVR USB driver * Author: Christian Starkjohann * Creation Date: 2004-12-29 * Tabsize: 4 * Copyright: (c) 2005 by OBJECTIVE DEVELOPMENT Software GmbH * License: Proprietary, free under certain conditions. See Documentation. * This Revision: $Id: usbdrv.c 205 2006-06-23 19:01:45Z cs $ */#include "iarcompat.h"#ifndef __IAR_SYSTEMS_ICC__#   include <avr/io.h>#   include <avr/pgmspace.h>#endif#include "usbdrv.h"#include "oddebug.h"/*General Description:This module implements the C-part of the USB driver. See usbdrv.h for adocumentation of the entire driver.*/#ifndef IAR_SECTION#define IAR_SECTION(arg)#define __no_init#endif/* The macro IAR_SECTION is a hack to allow IAR-cc compatibility. On gcc, it * is defined to nothing. __no_init is required on IAR. *//* ------------------------------------------------------------------------- *//* raw USB registers / interface to assembler code: *//* usbRxBuf MUST be in 1 byte addressable range (because usbInputBuf is only 1 byte) */__no_init uchar usbRxBuf[2][USB_BUFSIZE] __attribute__ ((section (USB_BUFFER_SECTION))) IAR_SECTION(USB_BUFFER_SECTION);/* raw RX buffer: PID, 8 bytes data, 2 bytes CRC */uchar       usbDeviceAddr;      /* assigned during enumeration, defaults to 0 */uchar       usbNewDeviceAddr;   /* device ID which should be set after status phase */uchar       usbConfiguration;   /* currently selected configuration. Administered by driver, but not used */uchar       usbInputBuf;        /* ptr to raw buffer used for receiving */uchar       usbAppBuf;          /* ptr to raw buffer passed to app for processing */volatile schar usbRxLen;        /* = 0; number of bytes in usbAppBuf; 0 means free */uchar       usbCurrentTok;      /* last token received, if more than 1 rx endpoint: MSb=endpoint */uchar       usbRxToken;         /* token for data we received; if more than 1 rx endpoint: MSb=endpoint */uchar       usbMsgLen = 0xff;   /* remaining number of bytes, no msg to send if -1 (see usbMsgPtr) */volatile schar usbTxLen = -1;   /* number of bytes to transmit with next IN token */uchar       usbTxBuf[USB_BUFSIZE];/* data to transmit with next IN, free if usbTxLen == -1 */#if USB_CFG_HAVE_INTRIN_ENDPOINTvolatile schar usbTxLen1 = -1;  /* TX count for endpoint 1 */uchar       usbTxBuf1[USB_BUFSIZE];/* TX data for endpoint 1 */#if USB_CFG_HAVE_INTRIN_ENDPOINT3volatile schar usbTxLen3 = -1;  /* TX count for endpoint 1 */uchar       usbTxBuf3[USB_BUFSIZE];/* TX data for endpoint 1 */#endif#endifuchar       usbAckBuf[1] = {USBPID_ACK};    /* transmit buffer for ack tokens */uchar       usbNakBuf[1] = {USBPID_NAK};    /* transmit buffer for nak tokens *//* USB status registers / not shared with asm code */uchar           *usbMsgPtr;     /* data to transmit next -- ROM or RAM address */static uchar    usbMsgFlags;    /* flag values see below */static uchar    usbIsReset;     /* = 0; USB bus is in reset phase */#define USB_FLG_TX_PACKET       (1<<0)/* Leave free 6 bits after TX_PACKET. This way we can increment usbMsgFlags to toggle TX_PACKET */#define USB_FLG_MSGPTR_IS_ROM   (1<<6)#define USB_FLG_USE_DEFAULT_RW  (1<<7)/*optimizing hints:- do not post/pre inc/dec integer values in operations- assign value of PRG_RDB() to register variables and don't use side effects in arg- use narrow scope for variables which should be in X/Y/Z register- assign char sized expressions to variables to force 8 bit arithmetics*//* ------------------------------------------------------------------------- */static PROGMEM char usbDescrDevice[] = {    /* USB device descriptor */    18,         /* sizeof(usbDescrDevice): length of descriptor in bytes */    USBDESCR_DEVICE,    /* descriptor type */    0x01, 0x01, /* USB version supported */    USB_CFG_DEVICE_CLASS,    USB_CFG_DEVICE_SUBCLASS,    0,          /* protocol */    8,          /* max packet size */    USB_CFG_VENDOR_ID,  /* 2 bytes */    USB_CFG_DEVICE_ID,  /* 2 bytes */    USB_CFG_DEVICE_VERSION, /* 2 bytes */#if USB_CFG_VENDOR_NAME_LEN    1,          /* manufacturer string index */#else    0,          /* manufacturer string index */#endif#if USB_CFG_DEVICE_NAME_LEN    2,          /* product string index */#else    0,          /* product string index */#endif#if USB_CFG_SERIAL_NUMBER_LENGTH    3,          /* serial number string index */#else    0,          /* serial number string index */#endif    1,          /* number of configurations */};#if !USB_CFG_EXTERNAL_CONFIG_DESCRIPTOR_LENGH#define USB_CFG_EXTERNAL_CONFIG_DESCRIPTOR_LENGH    sizeof(usbDescrConfig)static PROGMEM char usbDescrConfig[] = {    /* USB configuration descriptor */    9,          /* sizeof(usbDescrConfig): length of descriptor in bytes */    USBDESCR_CONFIG,    /* descriptor type */    (18 + 7 * USB_CFG_HAVE_INTRIN_ENDPOINT#if USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH     + 9#endif        ), 0,   /* total length of data returned (including inlined descriptors) */    1,          /* number of interfaces in this configuration */    1,          /* index of this configuration */    0,          /* configuration name string index */#if USB_CFG_IS_SELF_POWERED    USBATTR_SELFPOWER,  /* attributes */#else    USBATTR_BUSPOWER,   /* attributes */#endif    USB_CFG_MAX_BUS_POWER/2,            /* max USB current in 2mA units *//* interface descriptor follows inline: */    9,          /* sizeof(usbDescrInterface): length of descriptor in bytes */    USBDESCR_INTERFACE, /* descriptor type */    0,          /* index of this interface */    0,          /* alternate setting for this interface */    USB_CFG_HAVE_INTRIN_ENDPOINT,   /* endpoints excl 0: number of endpoint descriptors to follow */    USB_CFG_INTERFACE_CLASS,    USB_CFG_INTERFACE_SUBCLASS,    USB_CFG_INTERFACE_PROTOCOL,    0,          /* string index for interface */#if USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH    /* HID descriptor */    9,          /* sizeof(usbDescrHID): length of descriptor in bytes */    USBDESCR_HID,   /* descriptor type: HID */    0x01, 0x01, /* BCD representation of HID version */    0x00,       /* target country code */    0x01,       /* number of HID Report (or other HID class) Descriptor infos to follow */    0x22,       /* descriptor type: report */    USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH, 0,  /* total length of report descriptor */#endif#if USB_CFG_HAVE_INTRIN_ENDPOINT    /* endpoint descriptor for endpoint 1 */    7,          /* sizeof(usbDescrEndpoint) */    USBDESCR_ENDPOINT,  /* descriptor type = endpoint */    0x81,       /* IN endpoint number 1 */    0x03,       /* attrib: Interrupt endpoint */    8, 0,       /* maximum packet size */    USB_CFG_INTR_POLL_INTERVAL, /* in ms */#endif};#endif /* USB_CFG_EXTERNAL_CONFIG_DESCRIPTOR_LENGH */static PROGMEM char usbDescrString0[] = {   /* language descriptor */    4,          /* sizeof(usbDescrString0): length of descriptor in bytes */    3,          /* descriptor type */    0x09, 0x04, /* language index (0x0409 = US-English) */};#if USB_CFG_VENDOR_NAME_LENstatic PROGMEM int  usbDescrString1[] = {    USB_STRING_DESCRIPTOR_HEADER(USB_CFG_VENDOR_NAME_LEN),    USB_CFG_VENDOR_NAME};#endif#if USB_CFG_DEVICE_NAME_LENstatic PROGMEM int  usbDescrString2[] = {    USB_STRING_DESCRIPTOR_HEADER(USB_CFG_DEVICE_NAME_LEN),    USB_CFG_DEVICE_NAME};#endif/* We don't use prog_int or prog_int16_t for compatibility with various libc * versions. Here's an other compatibility hack: */#ifndef PRG_RDB#define PRG_RDB(addr)   pgm_read_byte(addr)#endiftypedef union{    unsigned    word;    uchar       *ptr;    uchar       bytes[2];}converter_t;/* We use this union to do type conversions. This is better optimized than * type casts in gcc 3.4.3 and much better than using bit shifts to build * ints from chars. Byte ordering is not a problem on an 8 bit platform. *//* ------------------------------------------------------------------------- */#if USB_CFG_HAVE_INTRIN_ENDPOINTstatic uchar    usbTxPacketCnt1;#if USB_CFG_IMPLEMENT_HALTstatic uchar    usbHalted1;         /* not 0 if endpoint 1 is halted */#endifvoid    usbSetInterrupt(uchar *data, uchar len){uchar       *p, i;#if USB_CFG_IMPLEMENT_HALT    if(usbHalted1)        return;#endif#if 0   /* No runtime checks! Caller is responsible for valid data! */    if(len > 8) /* interrupt transfers are limited to 8 bytes */        len = 8;#endif    i = USBPID_DATA1;    if(usbTxPacketCnt1 & 1)        i = USBPID_DATA0;    if(usbTxLen1 < 0){      /* packet buffer was empty */        usbTxPacketCnt1++;    }else{        usbTxLen1 = -1;     /* avoid sending incomplete interrupt data */    }    p = usbTxBuf1;    *p++ = i;    for(i=len;i--;)        *p++ = *data++;    usbCrc16Append(&usbTxBuf1[1], len);    usbTxLen1 = len + 4;    /* len must be given including sync byte */#if DEBUG_LEVEL > 1    DBG2(0x21, usbTxBuf1, len + 3);#else    DBG1(0x21, usbTxBuf1 + 1, 2);#endif}#endif#if USB_CFG_HAVE_INTRIN_ENDPOINT3static uchar    usbTxPacketCnt3;void    usbSetInterrupt3(uchar *data, uchar len){uchar       *p, i;    i = USBPID_DATA1;    if(usbTxPacketCnt3 & 1)        i = USBPID_DATA0;    if(usbTxLen3 < 0){      /* packet buffer was empty */        usbTxPacketCnt3++;    }else{        usbTxLen3 = -1;     /* avoid sending incomplete interrupt data */    }    p = usbTxBuf3;    *p++ = i;    for(i=len;i--;)        *p++ = *data++;    usbCrc16Append(&usbTxBuf3[1], len);    usbTxLen3 = len + 4;    /* len must be given including sync byte */#if DEBUG_LEVEL > 1    DBG2(0x23, usbTxBuf3, usbTxLen3 - 1);#else    DBG1(0x23, usbTxBuf3 + 1, 2);#endif}#endifstatic uchar    usbRead(uchar *data, uchar len){#if USB_CFG_IMPLEMENT_FN_READ    if(usbMsgFlags & USB_FLG_USE_DEFAULT_RW){#endif        uchar i = len, *r = usbMsgPtr;        if(usbMsgFlags & USB_FLG_MSGPTR_IS_ROM){    /* ROM data */            while(i--){                uchar c = PRG_RDB(r);    /* assign to char size variable to enforce byte ops */                *data++ = c;                r++;            }        }else{                  /* RAM data */            while(i--)                *data++ = *r++;        }        usbMsgPtr = r;        return len;